The Supreme Court delivered a major victory on Monday to an anti-abortion group that sought to challenge an Ohio law that bans campaign statements deemed to be false.

The justices, in a unanimous decision, ruled that the Susan B. Anthony List can go ahead with a lawsuit challenging the law as a violation of free-speech rights.

Both liberal and conservative groups have criticized the law, saying it has a chilling effect on political speech. Even Ohio attorney general Mike DeWine declined to defend the law in court, sending his deputies to argue for the state.

The Susan B. Anthony List was accused of violating the law during the 2010 election, when it accused then-Ohio Democratic Rep. Steve Driehaus of supporting taxpayer-funded abortion because he backed the new health care law.

Driehaus threatened to take them before the Ohio commission that reviews the accuracy of political ads.

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